Hidden Quasars in Ultraluminous Infrared Galaxies
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Many ultraluminous infrared galaxies (ULIRGs) are powered by quasars hidden in the center, but many are also powered by starbursts. A simply diagnostic diagram is proposed that can identify obscured quasars in ULIRGs by their high-ionization emission lines ([O III] 5007/Hbeta >~ 5), and ``warm'' IR color (f_{25}/f_{60} >~ 0.25).
2 pages including 2 postscript figures to be published in the proceedings of the IAU Symposium No. 194: "Activity in Galaxies and Related Phenomena", held in Byurakan, Armenia, 17-21 August 1998
2 pages including 2 postscript figures to be published in the proceedings of the IAU Symposium No. 194: "Activity in Galaxies and Related Phenomena", held in Byurakan, Armenia, 17-21 August 1998